ConfigGenerator

Terraform Variables Generator

Generate Terraform variables.tf files with string, number, bool, list, map, object, optional values, validation, defaults, tags, and tfvars examples.

Output:A ready-to-use configuration file for Terraform Variables with best practices applied.

Variable Definitions

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Quick Summary

A Terraform Variables Generator helps developers quickly build robust variables.tf files with explicit types, default values, descriptions, and custom validation rules.

What is this tool?

Terraform variables allow you to write configuration that is dynamic and reusable across different environments. A Terraform Variables Generator removes the syntax guessing game when creating complex variable types like deeply nested objects, maps, lists, and optional attributes, ensuring your variables.tf is clean and strictly typed.

How to Use This Tool

  1. Name Your Variable — Enter an identifier for the variable (e.g., instance_type, environment).
  2. Select the Type — Choose from string, number, bool, list, map, or object types.
  3. Add Descriptions & Defaults — Provide a helpful description and an optional default value.
  4. Configure Validation (Optional) — Set up validation rules to enforce input constraints.
  5. Generate — Copy the resulting variables.tf and terraform.tfvars.example snippets.

What This Tool Generates

  • variables.tf — The variable definitions block.
  • terraform.tfvars.example — A template for providing variable values.
  • variables.auto.tfvars.example — Automatic variable loading example.
  • A generated README variable table.

Example Output Explanation

A variable with custom validation and sensitivity:

variable "db_password" {
  type        = string
  description = "The master password for the RDS instance"
  sensitive   = true

  validation {
    condition     = length(var.db_password) >= 8
    error_message = "The db_password must be at least 8 characters long."
  }
}

Best Practices

  • Always provide a <code>{`description`}</code> for your variables to auto-document your code.
  • Use the <code>{`validation {}`}</code> block to enforce naming conventions, string lengths, or allowed choices (like 'dev', 'staging', 'prod').
  • Keep <code>{`terraform.tfvars`}</code> files out of version control if they contain sensitive environment details.
  • Use <code>{`sensitive = true`}</code> for passwords or API keys to hide them from the CLI output.

Common Mistakes

  • Committing <code>{`.tfvars`}</code> files containing plaintext secrets to a public Git repository.
  • Leaving variable types implicitly as 'any', bypassing Terraform's strict type checking.
  • Not providing default values for non-critical variables, forcing users to input too many variables during apply.

Security Notes

  • <strong>Do not generate real secret values.</strong> Use placeholders.
  • <strong>Sensitive Flag:</strong> Always recommend <code>{`sensitive = true`}</code> for secret-like variables so Terraform redacts them in console output.
  • <strong>Secret Managers:</strong> Recommend fetching production secrets using data sources (e.g., AWS Secrets Manager, HashiCorp Vault) instead of passing them via plain <code>{`.tfvars`}</code>.

Testing Instructions

  • Create a <code>{`terraform.tfvars`}</code> file with test values.
  • Run <code>{`terraform plan`}</code> to verify the variables are ingested correctly without prompting.
  • Test your validation rules by passing intentionally invalid inputs to trigger the <code>{`error_message`}</code>.

Frequently Asked Questions

What is a Terraform Variables Generator?
It is a tool that generates properly formatted variables.tf definitions with types, descriptions, and validation logic.
How do I create variables.tf?
You define variable blocks containing the type, description, and optional default values, and save them in a file named variables.tf.
What are Terraform variable types?
Terraform supports primitive types (string, number, bool) and complex types (list, map, set, object, tuple).
How do I use Terraform variables by environment?
You can create separate tfvars files (like dev.tfvars and prod.tfvars) and load them using the -var-file=dev.tfvars command line flag.
Can Terraform variables use JSON?
Yes, you can define variable values in JSON format using a terraform.tfvars.json file.
How do I mark a Terraform variable as sensitive?
Add the 'sensitive = true' argument inside your variable block. Terraform will hide its value in CLI outputs.

How We Keep Your Configs Safe & Valid

Built-in Error Checking

Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.

100% Private & Local

All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.

Secure Settings by Default

Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.

Ready for CI/CD & Git

Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.

Infrastructure as Code

Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.

Monitoring & Tracing

Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.

Container & Docker Safety

Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.

Multiple Output Formats

Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.

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